1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Full power screw won't turn in

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Old Feb 20, 2012 | 02:52 PM
  #1  
Chempowr's Avatar
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Default Full power screw won't turn in

Can anyOne help?

Trying to mod my pump. Bought longer fuel screw but after screwing it as far as possible, there is no performance gain or runaway. Any thoughts?
 
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Old Feb 20, 2012 | 06:02 PM
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lodal cummins's Avatar
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From: portland oregon
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Uh I'm not sure on the longer screw. That's a new one to me. I turned mine in like 2 1/4 turns and wow nice gain
 
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Old Feb 21, 2012 | 01:42 PM
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From: smyrna de
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Pdp sell em I have one in ole shakey at the same number of turns as the stocker it ranaway.

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Old Feb 21, 2012 | 01:43 PM
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From: smyrna de
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Try backing it out and advancing it a turn at a time. Have you removed the pump top? And have you backed off your idle? It should raise the idle the further you turn in till runaway. A ic pump doesn't respond as much as a non ic to cranking the fuel screw that being said it should still feel different.

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Last edited by moparbubbabt59l; Feb 21, 2012 at 01:48 PM.
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Old Apr 5, 2012 | 06:25 PM
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mines having the same probem with the longer fuel screw i dont think im getting full fuel
 
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Old Apr 5, 2012 | 08:38 PM
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Wonder if I should cut the collar off stock screw and see if there's any gain?
 
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